I am getting ready to take my SBE to Mexico on a dove hunt and took the gun apart, took the plug out and was generally giving it a good cleaning. When I put it back together, I heard a rattle and opened the chamber and found a small, cone shaped spring loose inside. The spring is @ 3/4" wide at the base, narrowing to 1/4" at the other end, and a 3/4" long. I have carefully looked through all the photos and diagrams in the manual and cannot find any such cone shaped spring anywhere. I have not had an opportunity to go to the range, but the gun feeds and ejects shells okay when operating the slide manually. I have owned this gun for over 10 years and have taken it down and reassembled it many times without problem but I do not ever recall seeing this spring before and cannot figure out where it came from. Could it have something to do with the plug or magazine follower? I don't want to get to Mexico and find out it is not working. Thanks.